Combined ruler and adding device.



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APrLIorrIon FILED 0012.3, 1901.

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H. L. HASKELL & J. A. MITCHELL. COMBINED RULER AND ADDING DEVICE.

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UNITED STATES Patented June 30, 1903.

PATENT OFFICE.

HENRY L. HASKELL AND JOHN A. MITCHELL, OF LDINGTON, MICHIGAN.

COMBINED RULER AND ADDING DEVIC.

SPECIFICATION forming part of Letters Patent No. 732,072, dated J'une30, 1903.

Application filed October 3,1901. Serial No. 77,477. (No model.)

To a/ZZ whom t may concern,.-

Be it known that we, HENRY L. HASKELL and JOHN A. MITCHELL,citizensofthe United States, residing at the city of Ludington, in the county ofMason and State of Michigan, have invented certain new and usefulImprovements in a Combined Ruler and Adding Device, of which thefollowingis a specication.

This invention relates to improvement-s in combined rulers and addingdevices.

The objects of the invention are, first, to provide an adding devicewhich shall be adapted to be combined with aruler or other instrumentand not interfere with their use in any manner; second, to provide anadding device which shall be simple and easy to operate and economicalto manufacture.

Further objects will vdefinitely appear in the detailed description tofollow.

We accomplish the objects of our invention by the devices and meansdescribed in this speciiication.

Theinventionis clearlydetined and pointed out in the claims.

A` structure embodying the features of our invention is fullyillustrated in the accompanying drawings, forming a part of thisspecification, in which- Figure lis a detail plan view of a combinedruler and adding device embodying the features of our invention. Fig. 2is a crosssectional view of the same, taken on line 2 2 of Fig. l. Fig.3 is a detail plan view of a modified form of our invention.

In the drawings the sectional view is taken looking in the'direction ofthe little arrows at the end of the section-line, and similar letters ofreference refer to similar parts throughout the several views.

Referring to the lettered parts of the drawings, A is a ruler, of Woodor other suitable material. In the upper surface of this ruler A is agroove A. 'On the bottom of this groove are numbers C, printed incolumns, the right-hand column in Fig. l of the drawings containing thenumbers from O to 110, consecutively, and the left-hand column numbers90 to 200, consecutively. The numbers in the right-hand column arenumbered up, while those in the the slot b".

left are numbered down. Opposite each number is a hole or spot c. Weprovide a slide B, having upwardly-projecting lugs or ears b, which isadapted to reciprocate in the groove A. This slide is cut away at eachside for a space equal to eleven numbers in the groove. It also hastransverse slots b on each side opening into the slots or cutawayportions b at opposite ends. On the face of the slide on each sideV andadjacent to the cut-away portions band numberedin directions tocorrespond with the numbers in the groove are the numbers l, 2, 3, 4, i(5,77 C( 6,77 (7,77 i 8,77 L( 9, C 0.77 bers are spaced to correspondwith the numbers in the groove.

We have described the mechanism in detail and will now describe itsoperation.

In use the slide Bis moved until the number to which it is desired toadd appears in A pointer is then placed in the hole c opposite thefigure on the slide which it is desired to add and the slide pushed upto the pointer, when the sum will appear through the slot b". The slotsb are of such length that the ends coming in contact with the pointerserve as stops forthe slide. The numbers exceeding one hundred at thetop of the right-hand column and those below one hundred at the foot ofthe left-hand column are for the purpose of transferring'from one columnto the other-as, for example, a sum is to be added to ninety-five whichwill carry it up into the hundreds, the operation is transferred to theleft-hand column, the slot in the slide B on the left-hand side will beat 95 and continued in that column. The operation of the modifiedstructure shown in Fig. 3 is the saine. A set of figures D is providedto assist in keeping the record of the hundreds, or a counter Dl isprovided to keep the record of the same. The same consists of a numbereddisk with pointer, as shown. It is apparent that this may be used withthe structure shown in Fig. l.

We have described our invention in detail in the form which we believeto be the most convenient to use and economical to manufacture; but weare aware, however, that it is capable of considerable variation withoudeparting from our invention.

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on said body portion; and a slide provided with suitable stops adaptedto reciprocate in said groove, having consecutive numbers thereon spacedto correspond with the numbers on said body portion, for the purposespecified.

In Witness whereof we have hereunto set our hands and seals in thepresence of two witnesses.

HENRY L. HASKELL. JOHN A. MITCHELL. Vitnesses:

ARTHUR M. JOHNSON, EDITH S. DECKER.

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